do yourself/somebody an injustice

do (oneself or someone) an injustice

To view someone in an unfairly negative way. You're doing your kids an injustice by catering to their every whim—they need to learn to be independent.
See also: injustice

do yourself/somebody an inˈjustice

judge yourself/somebody unfairly: We may have been doing him an injustice. This work is good.
See also: injustice, somebody